Issues in Layout that do not fit into any other Layout component or which span multiple Layout components.

Bugs related to the top level presentation objects (pres shell, pres context, and document viewer), the frame constructor, and the base frame classes, as well as general issues with alignment and sizing, all belong here.

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User Story

From bug 237842 comment 31:
> We could probably win quite a lot of performance for all kinds of things by
> creating a single anonymous element that implements a complete scrollbar
> (instead of the complex XBL binding we currently use), and simplify a lot of
> stuff too. We could give that element a proper non-element-based API and move
> the thumb without having to do reflow. I thought there was a bug for this but I
> can't find it.

We're going to remove the XBL in Bug 1431246, replicating the markup that's currently in XBL anon content into XUL NAC. That doesn't change anything about the benefits from Comment 0 - just going to mark this as dependent since it'll move around where the DOM gets created.